SOURCES: GHG data-U.S. Department of Energy, Energy Information Administration,
Emissions of Greenhouse Gases in the United States 2000, table ES-2,
available at http://www.eia.doe.gov/,
as of May 2002.

GDP data-U.S. Department of Commerce, Bureau of Economic Analysis, National
Accounts Data, available at http://www.bea.gov/bea/dn1.htm,
as of May 2002.